I've Been Reincarnated as a Villainess' Older Brother

While playing at the secret base, Cain accidentally touched a suspicious magic tool (or magic spell) and endangered Royal Highness Arundilano, so he has been placed under house arrest once again.

Since his sword training at the Kingsguard and various tutoring sessions were suspended, Cain had a lot of free time on his hands.

This time, as it was not intentional, he was able to talk with Ilvalino and Dianna and had his meals in the dining room.

Even now, he was chatting with Ilvalino on the couch in Cain’s room.

“As a hobbyist, there are two explosions you should know about.”

“A hobbyist’s taste I see.”

“One is a dreamlike explosion that can be created without the use of gunpowder or magic, and the other is a rambling explosion that can be created with relatively simple tools.”

“Romantic.”

“It’s called dust explosion and steam explosion.”

“Dust and steam explosions.”

Ilvalino listened with a disinterested look on his face. Cain’s talks with Ilvalino were usually trivial, so he must have thought they were trivial this time as well.

“You should listen with a little more interest. It was this steam explosion that blew up the secret base the other day.”

“…. Wasn’t that Master Cain’s magic?”

Ilvalino seemed to be a little interested and took his gaze away from the book to look at Cain’s face.

“Oh, now I got your attention. I can only do medium power explosive magic, and even the most powerful explosive magic doesn’t explode that loudly. In the first place, explosive magic is a combination of fire and wind magic right? Do you remember what I was using back then?

“You were using fire magic and water magic.”

“Yes. I did the preparation with magic, but I used science, or rather natural phenomena, to create the explosion. The theory is simple: water explodes when it touches something very hot, you saw the explosion was big enough right?”

“Water exploding… is that really possible?”

“If you’re curious, I’ll explain it to you in detail next time I do an experiment. It’s dangerous, so don’t misuse it, okay?”

“I don’t know how hot it is, but I probably won’t be able to do it, so it’s okay.”

Perhaps intrigued by the idea of water exploding, Ilvalino tucked a bookmark into his book and closed it.

“Then there’s another rambling explosion, the dust explosion. It’s even easier.”

“Dust explosion?”

“Exactly. An explosion occurs when a large amount of fine powder is in the air and a spark happens.”

“That’s it?”

“That’s it.”

“Well, then the bakery must explode every day.”

“There are a lot of conditions, like a certain amount of airtight space, density of flying powder, etc.”

“Wait so it’s not that simple.”

“Come on, you can create an explosion with just powder and sparks. How cool is that?”

How cool is that? Cain waved his index finger in the air as he spoke.

It was hard for Ilvalino to deny because he had actually seen a steam explosion, but it was hard for him to believe that powder could explode.

“Natural phenomena are quite frightening, water alone can cause such an explosion. If you don’t know the logic behind it, you’ll never know what I’m talking about. ‘If you don’t know the logic, no one won’t even have the slightest doubt that I did it’.”

After that, Cain and Ilvalino were questioned by the Knight Commander and the Magician Commander, but their excuse of inadvertently activating a mysterious magical tool in an unmanned secret base was easily accepted.[Read this novel and other amazing translated novels from the original source at the “Novel Multiverse dot com” website @ novelmultiverse.com]

The Magician Commander was curious about the magic tool and wanted to know more about how it looked, felt, and worked, while the Knight Commander was curious about the hidden passageway from the city, the dust inside the secret base, and whether there were any furnishings.

Maybe he suspected that it was a hideout of a criminal organization. Cain waved a flag in his mind that he was right, but he didn’t show it on his face.

By now, the gendarmerie and others might be searching unattended warehouses and empty houses in the city. To see if there were any other secret passages.

The door of the room opened vigorously with a knock at the same time.

Dianna had arrived.

“I’ve finished my studies! Please play with me, big brother!”

“Dear Dianna, please wait for an answer after knocking before entering.”

“Okay~.”

Ilvalino complained to Dianna, who came in cheerfully. She answers every time, but she never tries to fix it.

She always responds well though.

“Diane, three!”

“Seven!”

Cain and Dianna have been playing the “add up to ten” game for a while now. It’s a game where you have to quickly answer the numbers that Cain says that adds up to 10.

If you can answer correctly, Cain will praise Dianna a lot, which is a win-win game. It was a game that Cain started to play in order to have an opportunity to praise Dianna, but thanks to this game, Dianna was able to add without using her fingers.

“What did your brother and I do?”

She tapped Cain’s thigh to shift his position, and he climbed up to sit next to her.

“We were just talking about dreams.”

“What do you mean dream?”

“Hmm? Longing for something you want and fantasies? I wonder what the exact definition of dreams is.”

“Difficult, isn’t it?”

When Cain tilted his head, Dianna also tilted her head in imitation.

It was like a mirror, Ilvalino thought. Even though they were different in size and hair length, they looked exactly alike in this way.

Maybe it was because Cain always looked so gentle when he was with Dianna.

“That’s right. Let’s make a secret base!”

“A secret base? That’s great! Is it a secret?”

“It’s a secret!”

Cain stood up, took Dianna in his arms, lifted her off the couch, and walked hand in hand around the room.

He and Dianna brought a chair from the study desk and placed it a short distance from the bed, with a book on the seat to weigh it down.

Then they pulled out the waistband from the gown in the closet and tied the two ends to the post that supported the canopy of the bed and the back of the chair, then covered it with a sheet to make a kind of simple tent.

Next, they turned over the small basket Cain was using as a wastebasket and placed it in the middle, then spread out a large handkerchief and placed it on top.

When they hung a small lantern in the middle of the waistband, the chair seemed to collapse under the weight, so we added more books to the seat.

In about an hour, a secret base made of sheet tents was completed.

There were candies on the table in the wastebasket, and the lantern-lit room was filled with stuffed animals that Dianna had brought with her, books that Ilvalino was reading, and Cain’s embroidery tools.

“It’s such a small space~ so if I don’t stick to Dianna, I’ll stick out~.”

Cain said while hugging Dianna.

“If you stick out, you’ll be found!”

She hugged the stuffed animal tightly.

“It’s too dark to read…”

frowned Ilvareno as he tried to read a book.

It’s a secret base, so we can eat snacks even if it’s not snack time. And since it’s a secret base, let’s talk about something secret. Or, It’s a secret base, so let’s hide our treasures! And so on.

The three of them chatted in their little tents in hushed voices until they were called for lunch.

When lunch was over and they returned to the room, the maid had cleaned up the secret base and there was no trace of it.

Ah, dream flies by quickly, Ilvalino thought.